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DESIGN OF A GENERIC ROTOR NOISE SOURCE FOR HELICOPTER FUSELAGE SCATTERING TESTS

Yin, Jianping and Zanotti, Alex and Rossignol, Karl-Stephane and Gibertini, G. and Vigevano, Luigi (2018) DESIGN OF A GENERIC ROTOR NOISE SOURCE FOR HELICOPTER FUSELAGE SCATTERING TESTS. 44th European Rotorcraft Forum (ERF) 2018, 18-21 September 2018, Delft, The Netherlands.

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Abstract

This paper deals with the activities conducted in the GARTEUR Action Group HC/AG-24 to address noise scattering of helicopter rotors in presence of the fuselage. The focus of the paper is on the design for a generic “tail rotor” noise source used in the fuselage scattering study. The main design criterion is that the generic rotor noise source should resemble the main characteristics of the tail rotor with clear harmonic components. A two bladed simplified tail rotor model is considered. The performance of the tail rotor model in terms of thrust and torque with respect to the advance ratio is calibrated in the POLIMI wind tunnel. Acoustic measurements of the tail rotor model were tested in the DLR Acoustic Wind tunnel Braunschweig AWB. The results of the rotor performance and the rotor acoustic characteristics are described. The spectral variations resulting from unsteadiness of the source are explored in both with and without wind. The noise characteristics such as the spectral content, sound levels at fixed distances, and the time varying nature of the sound field are discussed

Item URL in elib:https://elib.dlr.de/122377/
Document Type:Conference or Workshop Item (Speech)
Title:DESIGN OF A GENERIC ROTOR NOISE SOURCE FOR HELICOPTER FUSELAGE SCATTERING TESTS
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Yin, JianpingJianping.Yin (at) dlr.deUNSPECIFIED
Zanotti, AlexDipartimento di Scienze e Tecnologie Aerospaziali, Politecnico di MilanoUNSPECIFIED
Rossignol, Karl-StephaneKarl-Stephane.Rossignol (at) dlr.deUNSPECIFIED
Gibertini, G.Politecnico di Milano - Dipartimento di Ingegneria Aerospaziale, Via La Masa 34, 20156 Milano, ItalyUNSPECIFIED
Vigevano, LuigiPolitecnico di MilanoUNSPECIFIED
Date:September 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Helicopter Acoustics, Rotorcraft Fuselage Scattering, Computational Aero-Acoustiacoustic, scattering test, shielding experiments,spheres, noise Propagation, analytical solution, DLR Laser generated Sound,DLR Acoustic Wind Tunnel, GARTEUR
Event Title:44th European Rotorcraft Forum (ERF) 2018
Event Location:Delft, The Netherlands
Event Type:international Conference
Event Dates:18-21 September 2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Quiet und Comfortable Rotorcraft
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, BS
Institute for Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Yin, Dr.-Ing. Jianping
Deposited On:12 Nov 2018 11:59
Last Modified:12 Nov 2018 11:59

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